+word | must include this word | +security |
-word | must exclude this word | -privacy |
a | b | either term (OR) | virtualization | hypervisor |
( ) | group terms | (cloud computing) | virtualization |
"phrase" | exact phrase | "red blood cell" |
word* | prefix wildcard | fractur* matches fracture, fractures, fracturing |
word~N | fuzzy match, edit distance N | osteotomy~2 |
"phrase"~N | proximity — up to N words between terms | "pelvic ring"~3 |
Plain words with no operator are matched loosely (fuzzy-ish relevance). Combine operators freely, e.g. "acetabular fracture" +("total hip" | arthroplasty) -pediatric.